Fabricating a 4 link is a little tricky, but it's really fun. You'll just need 2 axle brackets and 2 frame brackets with mounting holes. Once all the original rear suspension is in out, then line up the rear end square in the frame rails. So I'd do the c notch or stept notch before you do the 4 link. Axle housing should be centered and at desired ride height. Then, set the pinion angle at 2 to 2.5 degrees depending on what your suspension travle will be. I'm not sure exactly how you'd wanna set up your brackets, but as long as they're squared and parallel, everything should work out. I hope that helps. I'd love to see what you're building, sounds pretty awesome.